求翻译：如《小乌鸦爱妈妈》是一首两声部的合唱歌曲，此前，学生很少接触过分声部歌曲，为了让学生在演唱时做到声部和谐、音高、节奏准确，是什么意思？

Such as "Little Crow Love Mama" is one or two choral Ministry, students had little contact with the over-part song, in order to enable students to do the voices singing harmony, pitch, accurate rhythm,

Such as the small Crow Mother of love is one of the first two channels against choral songs, prior to this, students have little contact with excessive channels against songs, in order to allow students to return to Harmony singing, pitch, tempo, and accurate

If "Small Crow Loves Mother" is a two musical part chorus song, before this, the student very little contacts the excessive musical part song, in order to let the student in singer time achieves the musical part harmony, the pitch, the rhythm is accurate,

Like the little Crow mother is a two-part chorus songs, after students had little contact with too much voice and songs, in order to let students do voices when singing harmony and rhythm, pitch, and accurate,

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